Consider two equilibrium 2Cl2g+2H2Og⇌  4HClg+O2g and N2g+O2g⇌  2NOg simultaneously established in a closed vessel. When some amount of HCl is added at constant volume at equilibrium, which of the following statement is correct

When some amount of HCl added to equilibrium, the first equilibrium. will shift in backward direction leading to decrease in amount of O2. Then, the second equilibrium. will shift in backward direction to increase the amount of O2. Thus, amount of N2 gas will increase.